Idea rationaria, or, The perfect accomptant : necessary for all merchants and trafficquers : containing the true forme of book-keeping according to the Italian methode : wherein is first the introduction to the forme, 244 queries and answers, with instructions how to ballance the leger, two waste-books transported in two journals, out of which are transported 2 legers both ballanced : after which followes a moneth-book, invoys-book, factor-book, specie or cash-book, instructions how to keep a book of petty-charges or pocket-book /